If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Can you solve below mathematical equation?

2^1234 - 2^1233

Buy me, smell me or deliver me, I do not change.

Who am I?

The dirtier I get, the whiter I look. Who am I?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?